Is it better to be blunt and ask a girl out or wait?

Is it better to just ask a girl out by saying something like ''I think you're absolutely beautiful and you seem very interesting so, would you like to have coffee sometime?'' Or should I approach her slowly and wait till I know her better?

Thanks
Updates
+1 y
By the way, I've never spoken to her, she's in my class.
Is it better to be blunt and ask a girl out or wait?
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